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This is a classification of tumours and tumour-like lesions of the gall bladder and extrahepatic bile ducts, including the ampulla of Vater. Although most of the lesions are found in all three sites, variations in frequency of the histological types occur and will be noted. The incidence of carcinoma of the gallbladder varies in different parts of the world. Variation is also found in different ethnic groups within the same country. In the United States, for example, carcino ma of the gallbladder is more common in American Indians than in Caucasians or in Blacks; the rate among female...